Flange - Description
Flange - Specifications
- BS 10 - Specification for Flanges and Bolting for Pipes, Valves, and Fittings
- BS 3293 - Specification for Carbon Steel Pipe Flanges (over 24 inches nominal size) for the Petroleum Industry
- BS 4504 - Specification for Steel Flanges Circular Flanges for Pipes, Valves and Fittings
- ISO 7005-1 - Metallic Flanges - Part 1: Steel Flanges (this is substantially the same as BS 4504)
Flange - Materials
- Standards usually specify the material from which the flange is produced.
Flange - Size
- There are available flange sizes and grades for all standard pipe wall thicknesses and pressure ratings.
Flange - Facing Types
- The typical flange faces used are flat face, raised face, tongue and groove and ring joint.
Face Finish
- The flange face finish is determined by the standard used and measured as an Arithmetical Average Roughness Height (AARH). An example would be ANSI B16.5 which specifies face finishes within a range 125AARH - 500AARH (3.2 Ra to 12.5 Ra).
Flange - Specification and Identification
Flange - Class Rating
| Flange
Type |
BS4504
(ISO 7005-1) DN 10 to DN 4000 |
BS2393
26"-60" |
|---|---|---|
| Blind | 2.5-40 | - |
| Lap Joint | 6-40 | - |
| Slip-On | 2.5-40 | 150-600 |
| Socket | - | - |
| Threaded | 6-40 | - |
| Weld Neck | 2.5-40 | 150-600 |
| Flat/Raised Facing | As Above | As Above |
| Ring Joint Facing | 2.5-40 | 300-600 |
| Other Facings | 2.5-40 | - |
Flange - Pressure Classes
Flange - Maximum Pressure and Temperature Ratings
Flange - Dimensional Tolerances
Flange - Welding Bevel Standard
Data shown on this page was either gathered and verified using data available in the public domain or has been calculated by the staff at Piping-Designer.com. It is up to the end user to verify data prior to use for any project. This page may not be reproduced without the explicit written permission of Piping-Designer.com.
